/*
 * Copyright 2025 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.ai.edge.gallery.ui.common.chat

import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.alpha
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import com.google.ai.edge.gallery.ui.common.humanReadableDuration
import com.google.ai.edge.gallery.ui.theme.GalleryTheme

/**
 * Composable function to display the latency of a chat message, if available.
 */
@Composable
fun LatencyText(message: ChatMessage) {
  if (message.latencyMs >= 0) {
    Text(
      message.latencyMs.humanReadableDuration(),
      modifier = Modifier.alpha(0.5f),
      style = MaterialTheme.typography.labelSmall,
    )
  }
}


@Preview(showBackground = true)
@Composable
fun LatencyTextPreview() {
  GalleryTheme {
    Column(modifier = Modifier.padding(16.dp), verticalArrangement = Arrangement.spacedBy(16.dp)) {
      for (latencyMs in listOf(123f, 1234f, 123456f, 7234567f)) {
        LatencyText(
          message = ChatMessage(
            latencyMs = latencyMs,
            type = ChatMessageType.TEXT,
            side = ChatSide.AGENT
          )
        )
      }
    }
  }
}